Propeller having adjustable blades



Oct. 7, 1952 c. KAPSENBERG 2,612,961

PROPELLER HAVING ADJUSTABLE BLADES Filed Feb. 27, 1947 2 SHEETS-SHEET lOct. 7, 1952 c, KAPSENBERG 2,612,961

PROPELLER HAVING ADJUSTABLE BLADES Filed Feb. 27, 1947 2 SHEETS-SHEET 2FIG .4.

I77 vevz Zm- Corwe PM ffii serz eky Patented Oct. 7, 1 952 PROPELLER.HAVING ADJUSTABLE BLADES Cornell s Kapsenberg, Middelburg, Netherlands,assignor to N. V. Koninklijke Maatschappij ,De

Schelde, Vlissingen, Netherlands, acompany of the NetherlandsApplication February 21, 1947, SerialNo. 731,257

. 1" In the Netherlands March 9," 1943 Section 1, Public Law 690, August8, 1946 Patent expires March}, 1963 2 Claims. (01. oe-160.24)

1 The invention relates to a propeller for airor watercraft comprisingone or more pairs of diametrically disposed adjustable blades which canbe actuated for adjustment from the craft, the said-blades havingcrank-shaped root end portions supported in the propeller hub by meansof trunnion members disposed at opposite ends of each of thecrank-shaped portions, the actuating mechanism acting on the saidcrankshaped portions.

It is another object of the invention to procure a construction whichcan be easily fitted together.

It is a further object of the invention to provide the crank-shapedportions with bearingsat two points spaced apart in order to obtain astrong andstiff support for the propeller blades.

2 Figure 3 is a side view of a its crank and trunnion.

Figure 4 is a sectional view of the hub. In Fig. 1 the propeller hub isindicated by I propeller blade and and the blade 2 and 3 arediametrically arranged.

The blade roots 4 and 5 include crank portions and are mutually of thesame design. The portion 5 has a big bearing or shaft part 8 at the topconstituting a trunnion which is rotatably mounted in a bearin in theperiphery of the hub I. At its lower end the portion 5 is provided witha smaller bearing 0r shaft part 9 bearing in the center of the bigbearing part or trunnion 6 of of the hub l.

According'to the invention each of the root ends of the blade isprovided with two crank cheeks and with two bearin parts, the bearingparts of each blade root having different diameters, the bearing part ofeach root havingthe larger diameter being located at the side of the 1and the bearing parts of the blade roots are made in the form of counteror thrust flanges therefor.

Due to this construction a new blade can be fitted when the old one isbroken, in just the same way as ,in an ordinary propeller, withoutremoving. anything from the hub or from the actuating mechanism ordismantling some other part of the propeller.

The construction according to the invention may be such as to enable thehub to be made in one piece (not in two halves for instance).

The crankshaped blade root ends may be fitted through the radial hubborings and engage inside each other within the hub.

In the drawings: Figure 1 is a cross sectional elevation of a. pro:

:peller hub taken at right angles to the axis of 'the hub at the pointwhere a pair of propeller blades are mounted in an adjustable manner onthe hub.

Figure 2 illustrates in side view a hub for a four-bladed propeller.

the other crankshaped portion 4 of the other blades, which, in its turn,bears in the periphery The small bearing part 1 at the free end of thecrankshaped portion 4 bears in the big bearing part 8 of the portion 5.

The actuating mechanism engages the crank portions 4 and 5 at the placesl0 and H formed as crank pins. The actuating rod is indicated by I4. Theradial forces again are taken up by flanges I3 which are mountedseparately. As shown in Fig. 3 the blades 3 are each provided with aflange-shaped foot 20 which is firmly attached by means of bolts 2! tothe flange-shaped part 8.

In the case of propellers having more than one pair of blades, e. g. inthe case of four-bladed propellers, the plane in which the second pairof blades will move may be arranged at some distance from the plane inwhich the first pair moves, as indicated in Fig. 2. In the case ofthree-bladed propellers each blade will move in ianother plane at rightangles to the axis of rotaion.

What I claim is:

1. A propeller comprising a hollow hub and a pair of bladesdiametrically protruding from said hub, the root ends of the bladesextending into the hub and being crank-shaped within the space insidethe hub, the portion of such root end between the blade and thecrank-shaped portion being cylindrical in shape to constitute atrunnion, said hub having a cylindrical boring at the side of the bladeserving as a bearing for said trunnion, said trunnion having a coaxialboring, the free end of the crank-shaped portion being provided with a,cylindrical projection extending to the opposite side of the hub andcoaxially with the said trunnion, said projection having a smallerdiameter than the said trunnion, the said projection bearing in thecoaxial borin of the trunnion that forms part of the other blade of thepair of blades with which the projection is coherent.

2. A propeller comprising a hollow hub and a pair of bladesdiametrically protruding from said hub, the blades being provided withflange shaped feet near the hub, such flange shaped foot of each bladebeing coaxially attached to a counter-.

flange-shaped member constituting a, trunnion, said hub having acylindrical boring in the cir-" cumference thereof serving as a bearingfor said,

trunnion, the said trunnion having a coaxial boring and forming part ofa crank-shaped member extending coaxially therewith into the hollow thesaid trunnion, the said projection bearing in the coaxial boring of thecounterfiange-shaped 7 15 said projection having a smaller diameter thantrunnion attached to the flange-shaped foot of the other blade of thepair of blades with which the projection is coherent.

' CORNELIS KAPSENBERG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number 4 Name Date 1,510,086 Englesson Sept. 30,1924 1,656,019 Roberts Jan. 10, 1928 2,417,003 MacAlpin Mar. 4, 1947FOREIGN PATENTS Number Country Date 11 ,625 Great Britain May 28, 1908

